a rare, very hard and brittle, silver-gray chemical element, one of the platinum metals, used as a hardener in alloys of platinum and palladium and as a catalyst: symbol, Ru; at. no. 44
Origin of rutheniumModL: so named (1828) by G. W. Osann, Estonian-Russian chemist who produced it in impure form from Medieval Latin Ruthenia, Russia (source of the ore) + -ium
A hard silver-white acid-resistant metallic element that is found in platinum ores and is used to harden platinum and palladium for jewelry and in alloys for nonmagnetic wear-resistant instrument pivots and electrical contacts. Atomic number 44; atomic weight 101.07; melting point 2,334°C; boiling point 4,150°C; specific gravity 12.1 (20°C); valence 0, 1, 2, 3, 4, 5, 6, 7, 8. See Periodic Table.
Origin of rutheniumFrom Medieval Latin Ruthenia Russia from Ruthenī Russians from Russian Rusin from Old Russian Rusĭ Russian ; see Russian .
- A metallic chemical element (symbol Ru) with an atomic number of 44.
Ruthenia + -ium